For circular motion I can't find a more readable introduction than Physics Classroom.
For a simple introduction to the ideas in Simple Harmonic Motion this site from Salford University is quite readable.
(On a more thorough search for useful resources, this remains the best I've found. It takes a little concentration but it's reasonably comprehensive and easier to understand than most sources)
If you find this cartoon from XKCD amusing then you're probably starting to think like a physicist.
If you're planning on using this as part of your final assignment, I stumbled across this article that you might find interesting:
Notes.
The big challenge for a lot of students is the maths. It helps enormously to see why we lump SHM and circular motion together - this page from the Aussie Physclips site has some really nice animations that illustrate this - just scroll down a tiny bit. Simple Harmonic Motion is typical of the ideas covered in A Level physics in that it examines a real life situation and then attempts to model it mathematically. One of the keys to this is understanding the nature of the relationship between displacement, velocity and acceleration. Areas to follow up: natural and driving frequency, energy in SHM - derivation, harmonic vibration.
As a preparation it will pay you to look at the idea of radians if you haven't done so before:
For circular motion I can't find a more readable introduction than Physics Classroom.
For a simple introduction to the ideas in Simple Harmonic Motion this site from Salford University is quite readable.
(On a more thorough search for useful resources, this remains the best I've found. It takes a little concentration but it's reasonably comprehensive and easier to understand than most sources)
If you find this cartoon from XKCD amusing then you're probably starting to think like a physicist.
If you're planning on using this as part of your final assignment, I stumbled across this article that you might find interesting:
Resources for the day:
Notes.
The big challenge for a lot of students is the maths. It helps enormously to see why we lump SHM and circular motion together - this page from the Aussie Physclips site has some really nice animations that illustrate this - just scroll down a tiny bit. Simple Harmonic Motion is typical of the ideas covered in A Level physics in that it examines a real life situation and then attempts to model it mathematically. One of the keys to this is understanding the nature of the relationship between displacement, velocity and acceleration.
Areas to follow up: natural and driving frequency, energy in SHM - derivation, harmonic vibration.